parse 'str=value' like document.cookie to objects

parse.js

var decode = decodeURIComponent;

function parse(str) {
  var obj = {};
  var pairs = str.split(/ *; */);
  var pair;
  if ('' == pairs[0]) return obj;
  for (var i = 0; i < pairs.length; ++i) {
    pair = pairs[i].split('=');
    obj[decode(pair[0])] = decode(pair[1]);
  }
  return obj;
}